n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 14 |
5 | 53 |
6 | 180 |
7 | 656 |
8 | 2195 |
9 | 7250 |
10 | 23044 |
11 | 71123 |
12 | 213368 |
13 | 624425 |
14 | 1784399 |
15 | 4986210 |
16 | 13657266 |
17 | 36691985 |
18 | 96863639 |
19 | 251472815 |
20 | 642811767 |
21 | 1619203005 |
22 | 4022796235 |
23 | 9864987052 |
24 | 23894800443 |
25 | 57205375668 |
26 | 135438579331 |
27 | 317296680619 |
[1,2,4,14,53,180,656,2195,7250,23044,71123,213368, 624425,1784399,4986210,13657266,36691985,96863639, 251472815,642811767,1619203005,4022796235, 9864987052,23894800443,57205375668,135438579331, 317296680619] |